I think it has more to do with the 1911 bashers that will always say that a 1911 needs top be perfectly maintained to function. So it's not that you should, but you could.

I used to shoot wit ha guy that tried to polish all the surfaces that contacted like the slide to frame believing it would need less lube. I don't see that to be necessary and possibly dangerous. Those parts are pretty smooth as is and the risk of doing harm is HUGE!

The 1911 has a good bit more frame to slide contact than more modern weapons like a Glock. This can cause more friction and the absence of lube or addition of crud a bigger issue. But fro my experience the 1911 holds up very well against other weapons in the area of reliability. The Video dispels a common myth. THe 191 can perform with little to no lube. But I wouldn't want to take the risk when it's my rump on the line.